Bhagavatapurana 10.4.38

10.4.38

yathāmayo 'ṅge samupekṣito nṛbhir na śakyate rūḍha-padaś cikitsitum /
yathendriya-grāma upekṣitas tathā ripur mahān baddha-balo na cālyate //

38. Just as a disease in the body, if neglected, strikes deep roots and becomes impossible for men to cure; just as the senses if neglected become unmanagable, so the enemy if neglected grows in strength and becomes difficult to be shaken.